AF Modes: Differences between One-Shot AF and Servo AF (EOS M3)

Update Terakhir : 02-Feb-2015
Nomor isu : 8202478300

Solusi

You can select the AF (Autofocus) operation to suit the shooting condition or subject. In Basic Zone modes, the optimum AF operation is set for the respective shooting mode.

REFERENCE

The shooting modes in which the AF mode can be selected are listed below:

,

In the following shooting modes, the AF mode is set to [One-Shot AF] and cannot be changed:

,

In sports mode () the AF mode is set to [Servo AF].

One-Shot AF for Still Subjects

This mode is suited for still subjects. When you press the shutter button halfway, the camera will focus only once.

When focus is achieved, the AF point will turn green and the beeper will sound.
While you hold down the shutter button halfway, the focus will be locked. You can then recompose the shot if desired.

Servo AF for Subjects Moving Back and Forth

This mode helps avoid missing shots of subjects in motion, because the camera continues to focus on the subject and adjust the exposure as long as you press the shutter button halfway.

The exposure is set at the moment the picture is taken.

NOTE

The camera does not shoot a picture while focusing, even if you press the shutter button all the way down. Continue to hold down the shutter button while following your subject. The shutter fires after focus is achieved.
If focus is not achieved, the AF frame will turn orange.
AF lock shooting is not available.

Also, if you set the self-timer to anything besides [

], it is set to [ONE SHOT].

REFERENCE

Once set to [SERVO AF], the camera focuses on the frame in the center of the screen if it cannot detect a face when the shutter button is pressed halfway down, even if [ +Tracking] is activated.
When servo AF is on, the exposure is not locked when you press the shutter button halfway and is not determined until the moment you shoot the picture, regardless of your current metering mode settings.
If you attach a lens with "STM" in the name, turn on servo AF for continual shooting with constant focus adjustment. Using this feature will reduce the continual shooting speed. If you operate the zoom during continuous shooting, the focus may be lost.
With other lenses, the focus will be locked for the second and subsequent frames during continuous shooting, resulting in slower continuous shooting.
Depending on the lens used, the distance to the subject and the subject’s speed, the camera may not be able to achieve correct focus.
This can also be adjusted by going to the menu and choosing [AF operation] on the [ -2] tab.